"Both of these branches of evolutionary science, are, in my opinion, in the closest causal connection; this arises from the reciprocal action of the laws of heredity and adaptation."

Action

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Thematic Reflection

This quotation examines the core nature of Action as articulated by Ernst Haeckel. Within historical and literary traditions, reflections on Action provide actionable mental models, challenging individuals to evaluate personal ethics, self-discipline, and daily actions.

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About Ernst Haeckel

Ernst Heinrich Philipp August Haeckel was a German zoologist, naturalist, eugenicist, philosopher, physician, professor, marine biologist and artist. He discovered, described and named thousands of new species, mapped a genealogical tree relating all life forms and coined many terms in biology, including ecology, phylum, phylogeny, ontogeny, and Protista. Haeckel promoted and popularised Charles Darwin's work in Germany and developed the disproven but influential recapitulation theory, later generalizing it into the so called "Biogenetic Law". He wrongly claimed that an individual organism's biological development, or ontogeny, parallels and summarizes its species' evolutionary development, or phylogeny, using incorrectly drawn images of human embryonic development to derive the law. Whether they were intentionally falsified, or drawn poorly by accident is a matter of debate.

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